I use Siemens EL-34s which I like a lot and have read a lot of good things about Mullards, EH, JJ, and cryoed Svetlana C wings. As for 12AU7s there are too many good ones out there, but Telefunken, Mullard and Amperex seem be to be the ones everyone talks about. I use NOS RCA from the '50s with the side getter. They are more reasonably priced and there is a better stock of them for easier matching.
